介紹了利用微處理機控制單元(MCU microprocessor control unit) 控制的超聲測距儀的原理:由MCU 控制時間計數(shù),計算超聲波自發(fā)射至接收的往返時間,從而得到實測距離。給出了系統(tǒng)構成、電路原理及程序設計。并且在數(shù)據(jù)處理中采用了溫度補償和修正量的調(diào)整。此系統(tǒng)具有易控制、工作可靠、測距準確度高和流程清晰等優(yōu)點。
關鍵詞: 微處理機控制單元; 超聲波傳感器; 測距; 溫度補償
Abstract : Principle and structure of ultrasonic distance measurement instrument by master of MCU are intro2 duced. With the control of MCU to operate the time2keeping ,distance from target to original point is gained using product with the time of ultrasonic transmitting both to the target and reflecting back and the speed of ultrasonic which transmits in the air. And system structure ,circuit philosophy and programming are also specified. In the process of data , temperature compensation and adjustment of amendment ammount are used , so the instrument system has features : ease of control , stability of operation , highness of precision and distinctness of programme process ,etc.
Key words : microprocessor control unit (MCU) ; ultrasonic sensor ; distance measurement ; temperature com2 pensation